A roller type two-sided telescopic finger cylinder with stable transmission

Abstract

The present invention discloses a roller type two-sided telescopic finger cylinder with stable transmission, which includes a housing, a linear motion cylinder and two coaxially arranged sliders. A wedge-shaped piston is arranged at one end of the output shaft of the linear motion cylinder close to the slider; the wedge-shaped piston is slidably connected with the slider to form a sliding pair, and the slider is arranged in a chute in the housing, and the chute is perpendicular to the movement direction of the output shaft; further included are: a roller guide rail group fixedly installed on the side wall of the chute, and the slider is provided with a first V-shaped groove adapted to the roller guide rail group to form a sliding pair; the first V-shaped groove is parallel to the chute; directional guidance is carried out through the roller guide rail group, and in the limited environment of internal sliding, the roller can guide the movement of the slider at the limit position and can provide a certain supporting force to prevent deviation during the movement process; precise and stable precise sliding control of the two-sided sliders for the full stroke can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of finger cylinders, and particularly to a roller-type two-side telescopic finger cylinder with stable transmission. Background Art

[0002] The pneumatic finger, commonly known as a finger cylinder, is also called a pneumatic gripper or pneumatic finger. It uses compressed air as power and is an actuator for gripping or grasping workpieces. It can usually be divided into Y-type fingers and flat-type fingers according to the style. Its main function is to replace human grasping work, which can effectively improve production efficiency and work safety.

[0003] The finger cylinder is a typical device that uses structural components to convert the movement displacement in different directions. For example, in the common structure of a finger cylinder, the cooperation of a pneumatic linear position output shaft and a slider is adopted to convert the movement of the output shaft into the displacement of the slider, and the displacement direction of the slider is inconsistent with the movement direction of the output shaft. Based on this basic structure, optimizations have been made in the prior art for aspects such as small clamping torque and complex transmission. For example, the document with the application number 201720747701.0 discloses a powerful pneumatic finger cylinder. The piston converts its own axial sliding into the radial clamping sliding of the fingers through a wedge mechanism, thereby realizing the synchronous clamping and tightening actions of the fingers on the workpiece. The cylinder has a large clamping torque; the associated dimensions of the wedge mechanism are few and the precision is high; the piston, fingers, and the sliding pairs formed by the two are all arranged in the cylinder body, and it can work in harsh environments such as liquid and dust, with strong applicability. However, this structure still has the phenomenon that the transmission is prone to structural interference and shaking in the cavity, especially when moving to the limit position, the gravity changes and the distribution is uneven. In the document with the application number 201821589776.1, a wedge mechanism for a finger cylinder is disclosed, including a shaft body, which includes a cylindrical rod and a first inclined arm and a second inclined arm symmetrically arranged at one end of the cylindrical rod. The first inclined arm and the second inclined arm are connected by a connecting beam, and the connecting beam is perpendicularly connected to the axial end of the cylindrical rod. The first inclined arm and the second inclined arm form equal acute angles with the axis of the cylindrical rod. The shaft body has a linear reciprocating freedom along the axial direction of the cylindrical rod; a slider, including a first slider and a second slider symmetrically arranged on both sides of the shaft body. The first slider and the second slider respectively have sliding grooves for assembling with the first inclined arm and the second inclined arm. The cross-sections of the first inclined arm, the second inclined arm, and the sliding grooves are T-shaped; the first slider and the second slider are provided with claws, and the slider is also provided with expansion edges, and the extending direction of the expansion edges is perpendicular to the axis of the cylindrical rod. Using this utility model, there are few parts, the force transmission form is simple, the linear displacement is converted into the opening and closing of the claws, the cost is low, and the structure is reliable. However, this structure still has the same problem. Since the movement directions of the shaft body and the slider are perpendicular, the shaft body is constrained by a vertical track, and the movement of the slider is constrained by a horizontal track. Therefore, the reaction force gradually increases after the movement displacement reaches the limit position. And due to the characteristics of the wedge structure, when moving to the expansion limit or the closing limit, the contact area between the shaft body and the slider decreases. Therefore, the acting area for resisting the reaction force decreases, resulting in the shaft body and the slider being displaced in their respective tracks; thus, jamming occurs, and the long-stroke movement of the finger cylinder cannot be realized. Therefore, it is urgent to solve the problem that the transmission structure in the prior art is unstable, prone to structural interference during the movement process, especially prone to displacement at the limit position. Summary of the Invention

[0004] Aiming at the problems existing in the above-mentioned technology, such as the unstable transmission structure of the existing finger cylinder, which is prone to structural interference during movement, especially prone to deviation at the limit position, a technical solution is provided to solve the problem.

[0005] To achieve the above object, the present invention provides a roller type two-side telescopic finger cylinder with stable transmission, which includes a housing, a linear motion cylinder and two coaxially arranged sliders. A wedge-shaped piston is arranged at one end of the output shaft of the linear motion cylinder close to the slider. The wedge-shaped piston is slidably connected with the slider to form a sliding pair. The slider is arranged in a chute in the housing, and the chute is perpendicular to the movement direction of the output shaft. The roller type two-side telescopic finger cylinder further includes:

[0006] A roller guide rail group, which is fixedly installed on the side wall of the chute. The slider is provided with a first V-shaped groove adapted to the roller guide rail to form a sliding pair. The first V-shaped groove is parallel to the chute.

[0007] Preferably, there are three groups of roller guide rail groups. Two groups of roller guide rail groups are arranged on both sides of the slider and are both parallel to the chute. One group of roller guide rail groups is arranged on the side of the slider away from the wedge-shaped piston and is parallel to the chute.

[0008] Preferably, the roller guide rail group includes:

[0009] A roller bar,

[0010] A guide rail, which is fixed on the inner wall of the housing. The roller bar is arranged between the slider and the guide rail and is embedded in the guide rail. The guide rail is provided with a second V-shaped groove adapted to the roller bar. The rollers of the roller bar are in transitional fit with the slider.

[0011] Preferably, the guide rail spans across the two sliders, and the guide rail is of the same length as the chute. Each guide rail is correspondingly provided with an even number of multi-section roller bars, and the roller bars are symmetrically and evenly distributed with respect to the wedge-shaped piston.

[0012] Preferably, there are two sections of roller bars, and each roller bar is correspondingly arranged for one slider.

[0013] Preferably, the housing includes two end covers, a base shell and a top cover. The base shell is provided with a receiving groove for the movement of the wedge-shaped piston, and the base shell, the end covers and the top cover enclose the chute. The chute and the receiving groove are vertically arranged.

[0014] Preferably, the two end covers are respectively located at both ends of the chute and are provided with through holes having the same shape and size as the slider. Among them, the end covers at both ends are in contact with both ends of the guide rail and limit the roller bar from disengaging from the guide rail.

[0015] Preferably, two first inclined hooks that are axially symmetric about the output shaft are provided on the wedge-shaped piston; a second inclined groove is provided at one end of the slider close to the wedge-shaped piston, and the wedge-shaped piston and the slider are in abutting connection through the first inclined hooks and the second inclined groove to form a sliding pair.

[0016] Preferably, a guiding groove is provided at the end of the first inclined hook to form a hook portion, and a guiding strip extends outward partially at the end of the second inclined groove to form a groove portion. The guiding strip is engaged with the guiding groove, and the hook portion is adapted to the groove portion; wherein, a plurality of friction surfaces are uniformly distributed on the surface of the guiding groove and are distributed in the relative sliding direction of the guiding groove and the guiding strip to form a structure in which smooth regions and friction regions are alternately distributed.

[0017] Preferably, a fixing ring is sleeved on the output shaft, the fixing ring and the housing are fixed by a positioning pin, and the fixing ring is used to prevent the output shaft from swinging.

[0018] The beneficial effects of the present invention are as follows: The present invention discloses a roller type two-side telescopic finger cylinder with stable transmission, including a housing, a linear motion cylinder, and two coaxially arranged sliders. A wedge-shaped piston is provided at one end of the output shaft of the linear motion cylinder close to the slider; the wedge-shaped piston is slidably connected to the slider to form a sliding pair, and the slider is disposed in a chute in the housing, and the chute is perpendicular to the movement direction of the output shaft; further including: a roller guide rail group fixedly installed on the side wall of the chute, and the slider is provided with a first V-shaped groove adapted to the roller guide rail to form a sliding pair; the first V-shaped groove is parallel to the chute; directional guiding is performed through the roller guide rail group, and in the limited environment of internal sliding, the roller can guide the movement of the slider at the limit position and can provide a certain supporting force to prevent deviation during the movement process; precise and stable precise sliding control of the two-side sliders throughout the stroke can be achieved. Description of the Drawings

[0019] Figure 1 is a perspective view of the present invention;

[0020] Figure 2 is an exploded view of the present invention;

[0021] Figure 3 is a cross-sectional view of the present invention;

[0022] Figure 4 is a schematic internal structure view of the present invention with the housing omitted;

[0023] Figure 5 is a structural diagram of the wedge-shaped piston of the present invention;

[0024] Figure 6 is a structural diagram of the slider of the present invention;

[0025] Figure 7 For the present invention Figure 5 a partial enlarged view at position B.

[0026] The main component symbols are explained as follows:

[0027] 1. Housing; 11. Slide groove; 12. End cover; 13. Base housing; 14. Top cover;

[0028] 2. Output shaft; 21. Wedge piston; 211. First inclined hook; 2111. Guide groove; 2112. Hook part; 22. Fixed ring;

[0029] 3. Slide block; 31. First V-shaped groove; 32. Second inclined groove; 321. Guide bar; 322. Groove part;

[0030] 4. Roller guide group; 41. Second V-shaped groove; 42. Roller bar; 43. Guide rail;

[0031] A. Friction surface. Detailed implementation manners

[0032] In order to more clearly describe the present invention, the present invention will be further described below with reference to the accompanying drawings.

[0033] In the following description, specific example details are given to provide a deeper understanding of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. It should be understood that the specific embodiments are only used to explain the present invention and are not used to limit the present invention.

[0034] It should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of the described features, wholes, steps, operations, elements or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components or combinations thereof.

[0035] The present invention discloses a roller type two-side telescopic finger cylinder with stable transmission. Please refer to Figures 1-7 ; It includes a housing 1, a linear motion cylinder, and two coaxially arranged slide blocks 3. A wedge piston 21 is provided at one end of the output shaft 2 of the linear motion cylinder close to the slide block; the wedge piston 21 and the slide block 3 are in sliding connection through inclined surface contact to form a sliding pair. The slide block 3 is arranged in the slide groove 11 in the housing, and the slide groove 11 is perpendicular to the movement direction of the output shaft. It further includes:

[0036] The roller guide rail set 4 is fixedly installed on the side wall of the chute 11. The slider 3 is provided with a first V-shaped groove 31 adapted to the roller guide rail set 4 to form a sliding pair. The first V-shaped groove 31 is parallel to the chute. The slider is restricted by the space of the chute to meet the basic sliding requirements. And the movement drive of the wedge piston is realized by the steering of the movement direction by two contacting inclined planes. Therefore, there is a tendency of deviation at the extreme movement position. Firstly, because the contact area of the two inclined planes becomes smaller at the extreme position. Secondly, at the extreme position, the slider extends out of the housing, weakening the supporting effect of the housing. As a result, the slider is affected by its own gravity. The combination of these two factors makes it easy to occur deviation. While using the roller guide rail set for guiding, due to the structural feature that the rollers are cross-set, it can provide a certain supporting force while rolling. And its placement position is inside the chute. As a component between the slider and the housing, it plays the role of a pre-tightening part, further strengthening the structural strength and effectively preventing the deviation phenomenon at the extreme position.

[0037] In this embodiment, there are three groups of roller guide rail sets. Two groups of roller guide rail sets are arranged on both sides of the slider and are both arranged parallel to the chute. One group of roller guide rail sets is arranged on the side of the slider away from the wedge piston and is arranged parallel to the chute. Because the bottom is the main supporting part of the housing, the setting can be reduced. And the movement directions of the wedge piston and the slider are perpendicular and drive from the bottom upwards. Therefore, a roller guide rail set is arranged at the top for guiding and limiting.

[0038] In this embodiment, the roller guide rail set 4 includes:

[0039] Roller bars 42,

[0040] Guide rails 43 are fixed on the inner wall of the housing. The roller bars 42 are arranged between the slider and the guide rails and are fitted in the guide rails. The guide rails 43 are provided with second V-shaped grooves 41 adapted to the roller bars. The rollers of the roller bars are in transitional fit with the slider. In general use scenarios, the rollers and the adapted devices can be in contact fit. However, in this solution, the transitional fit method can provide a pre-tightening force and can effectively adjust the acting force that changes in size during the movement process. In particular, the transitional fit can enable the slider to drive the roller bars to move together during the movement process to meet the use throughout the stroke. There is no need to load roller bars covering the full stroke length. Only after partial installation, the roller bars are forced to slide and displace during the pressure change process to meet all the movement contacts on the sliding stroke. Ensure stable contact at the end.

[0041] In this embodiment, the guide rail 43 straddles two sliders, and the guide rail 43 is of the same length as the sliding groove 11. An even number of multi-section roller bars 42 are correspondingly arranged for each guide rail 43, and the roller bars are symmetrically and evenly distributed with respect to the wedge-shaped piston. As mentioned above, the over-tight assembly of the roller bars and the sliders enables the roller bars to slide and shift accordingly to meet the full-stroke fitting and provide a pre-tightening force. Therefore, the guide rails need to be of the same length, while the roller bars only need to correspond to the number of sliders and be symmetrically arranged.

[0042] In this embodiment, each set of roller guide rail groups includes two sections of roller bars 42, and each roller bar is correspondingly arranged with one slider.

[0043] In this embodiment, the housing 1 includes two end caps 12, a base shell 13, and a top cover 14. The base shell is provided with a receiving groove for the movement of the wedge-shaped piston, and the base shell, the end caps, and the top cover enclose a sliding groove, and the sliding groove and the receiving groove are vertically arranged. Preferably, the two end caps 12 are respectively located at both ends of the sliding groove and are provided with through holes having the same shape and size as the sliders; firstly, the shape of the sliding groove is completely adapted to the sliding rail, and moreover, various V-shaped grooves are provided on the slider, and the cross-section has formed a polygonal cross-section. Although it is a symmetric structure, the increase in the contact surface leads to a further increase in its stability; among them, the two end caps 12 at both ends are in contact with both ends of the guide rail 43 and limit the roller bars from disengaging from the guide rail.

[0044] In this embodiment, two first inclined hooks 211 that are axially symmetric with respect to the output shaft are provided on the wedge-shaped piston 21; a second inclined groove 32 is provided at one end of the slider 3 close to the wedge-shaped piston 21, and the wedge-shaped piston and the slider are in contact through the first inclined hook and the second inclined groove to form a sliding pair. The inclined surface angle of the wedge-shaped structure has a force-multiplying effect and is more stable than an ordinary linkage structure. It is precisely because the thrust monotonically changes during the movement process, especially when reaching the limit position, the thrust increases, and it is more likely to vibrate. Therefore, the above-mentioned scheme is adopted for fixation and stability.

[0045] In this embodiment, a guiding groove 2111 is provided at the end of the first inclined hook 211 to form a hook portion 2112, and a guiding strip 321 extends outward from the end portion of the second inclined groove 32 to form a groove portion 322. The guiding strip 321 is engaged with the guiding groove 2111, and the hook portion 2112 is adapted to the groove portion 322. Among them, a plurality of friction surfaces A are uniformly distributed on the surface of the guiding groove 2111 and are distributed in the relative sliding direction of the guiding groove 2111 and the guiding strip 321 to form a structure in which smooth regions and friction regions are alternately distributed. Because its main transmission contact surface depends on the guiding groove and the guiding strip to complete, if both are smooth surfaces, then at the extreme position, due to the long-term large pressure, there will be a certain slope between some surfaces and other surfaces, resulting in not being on the same plane. Over time, an arc surface with both ends sinking will be formed; if a design with all friction surfaces on one surface is adopted, there will be a large contact resistance at the initial stage of transmission, and then the contact surface at the end will be gradually worn flat, and it will be more prone to dislocation when the driving force increases; while adopting an intermittent setting method and the friction surface is not higher than the smooth surface, so the friction particles will not be worn independently. Instead, after a certain amount of wear occurs, the damping feeling can also be formed by relying on other intermittent regions, and the transmission force does not change suddenly. The pressure at both ends is distributed on the smooth surface and the friction surface, forming a more gentle wear; it can be used for a long time; it ensures the movement stability at the extreme position from the source, and then in cooperation with the roller guide group with transition fit, the entire transmission process is reliable and stable, and even if there is a sudden change in force, it can move precisely under the constraint of multiple structures.

[0046] In this embodiment, a fixing ring 22 is sleeved on the output shaft 2. The fixing ring 22 is fixed to the housing by a positioning pin. The fixing ring is used to prevent the output shaft from swinging. The swinging of the output shaft is also one of the influencing factors of movement deviation. Therefore, using the fixing ring can effectively prevent the output shaft from swinging.

[0047] The advantages of the present invention are as follows:

[0048] 1. The transmission is stable at the extreme position of movement without deviation;

[0049] 2. The transition fit roller strip is adopted to achieve full-course following guidance, which simplifies the structure and improves the transmission stability of the structure at the same time.

[0050] The above are only several specific embodiments of the present invention disclosed, but the present invention is not limited thereto. Any changes that can be thought of by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A rolling type telescopic finger cylinder with stable transmission, comprising a housing, a linear motion cylinder and two coaxially arranged sliders. A wedge-shaped piston is arranged at one end of the output shaft of the linear motion cylinder close to the slider. The wedge-shaped piston is slidably connected with the slider to form a sliding pair. The slider is configured in a chute in the housing, and the chute is perpendicular to the movement direction of the output shaft. It is characterized in that, Further included are: A roller guide rail set, fixedly installed on the side wall of the chute. The slider is provided with a first V-shaped groove adapted to the roller guide rail set to form a sliding pair; the first V-shaped groove is parallel to the chute; Wherein, two first inclined hooks axially symmetric about the output shaft are provided on the wedge-shaped piston; a second inclined groove is provided at one end of the slider close to the wedge-shaped piston. The wedge-shaped piston and the slider are in abutting connection through the first inclined hooks and the second inclined groove to form a sliding pair; a guide groove is provided at the end of the first inclined hook to form a hook part, and a guide strip extends outward partially at the end of the second inclined groove to form a groove part. The guide strip is engaged with the guide groove, and the hook part is adapted to the groove part; wherein, a plurality of friction surfaces are evenly distributed on the surface of the guide groove and are distributed in the relative sliding direction of the guide groove and the guide strip to form a structure in which smooth areas and friction areas are alternately distributed; A fixed ring is sleeved on the output shaft. The fixed ring is fixed to the housing through a positioning pin, and the fixed ring is used to prevent the output shaft from swinging; There are also three groups of roller guide rail sets. Two groups of the roller guide rail sets are arranged on both sides of the slider and are both parallel to the chute. One group of the roller guide rail sets is arranged on the side of the slider away from the wedge-shaped piston and is parallel to the chute.

2. A rolling type two-side telescopic finger cylinder with stable transmission according to any one of claims 1, wherein, The roller guide rail set includes: A roller bar, A guide rail, fixed on the inner wall of the housing. The roller bar is arranged between the slider and the guide rail and is fitted in the guide rail; the guide rail is provided with a second V-shaped groove adapted to the roller bar; the rollers of the roller bar are in transitional fit with the slider.

3. The rolling type two-side telescopic finger cylinder with stable transmission according to claim 2, characterized in that, The guide rail spans across two of the sliders, and the guide rail is of the same length as the chute. Each guide rail is correspondingly provided with an even number of multi-section roller bars, and the roller bars are symmetrically and evenly distributed about the wedge-shaped piston.

4. A rolling type two - side telescopic finger cylinder with stable transmission according to claim 3, characterized in that, There are two sections of the roller bars, and each roller bar corresponds to one slider.

5. A rolling type two-side telescopic finger cylinder with stable transmission according to claim 3, characterized in that, The housing includes two end covers, a base shell and a top cover. The base shell is provided with a receiving groove for the movement of the wedge-shaped piston, and the base shell, the end covers and the top cover enclose the chute. The chute and the receiving groove are vertically arranged.

6. A rolling type two-side telescopic finger cylinder with stable transmission according to claim 5, characterized in that, The two end covers are respectively located at both ends of the chute and are provided with through holes having the same shape and size as the slider; wherein, the end covers at both ends are in abutting connection with both ends of the guide rail and limit the roller bar from disengaging from the guide rail.

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